Forums

Guest
Welcome Guest, posting in this forum require registration. Username Password Remember me

Torque » Torque OBD ECU Scanner » Torque Discussion / Ideas » Reading without polling "sniffing"

Pages: [1]

Author	Topic: Reading without polling "sniffing"

moreause

Member
Posts: 637

Reading without polling "sniffing"
on: June 3, 2014 (GMT)

Is it possible to read the bus without sending a request

i currently use custom pid for a project

i’m using an arduino to respond to a PID and insert the value on a gage

but lots on data is already on the bus and could be used probably faster…so just wondering if it could be read and used

if you can interpret it ….

like a bus sniffer mixed with obd request ??

frodus

Member
Posts: 518

Re: Reading without polling "sniffing"
on: June 3, 2014 (GMT)

Not as the program stands now. I too have to do the same thing. Still need to have a custom PID in torque poll the CAN bus.

It actually helps the CAN. There might be data like Air temperature that only responds when asked, so it’s never on the CAN. Others like RPM are constantly being polled by the ECU or broadcast.

piemmm

Administrator
Posts: 6629

Re: Reading without polling "sniffing"
on: June 4, 2014 (GMT)

If you’re using CAN then you shouldn’t be too worried about speed unless you’re looking for a lot of sensors

For example, if you’re using an OBDLink SX USB adapter, then you can get up to 200PIDs/second over canbus using Torque (tested using a Samsung S5)

Most of the limitations come from the adapter hardware or ECU protocol used (eg: older vehicles using the ISO9141 protocol can only retrieve data at about 7 sensors/second as the actual ECU protocol limits the speed)

moreause

Member
Posts: 637

Re: Reading without polling "sniffing"
on: June 5, 2014 (GMT)

Can you just connect these obd to usb into a android tablet ??

is this the one your talking

http://www.scantool.net/obdlink-sx.html

i currently have obdlink MX bluetooth and have around 45pid
so the refresh rate could be better

yes i was mostly thinking about those one rpm,speed ect and just grab them to be faster

i’m currently sniffing my OBD bus with my arduino

https://www.youtube.com/watch?v=0uvoeDMH4G8&feature=em-upload_owner#action=share

Nightrider

Member
Posts: 27